Fatal error: Uncaught Error: Call to undefined function add_filter() in /usr/home/apostolowie/domains/apostolowie.pl/public_html/wp-content/plugins/nextgen-gallery/src/Legacy/admin/media-upload.php:3
Stack trace:
#0 {main}
  thrown in /usr/home/apostolowie/domains/apostolowie.pl/public_html/wp-content/plugins/nextgen-gallery/src/Legacy/admin/media-upload.php on line 3